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Celebrate the 75th Anniversary of the Smoky Mountains National Park
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Ball club takes flak for 'ball-less' promo
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Statue of Liberty's crown reopens
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ESA: Rubidium clocks operating as expected
PARIS, May 21 (UPI) --
The European Space Agency says Europe's first satellite-borne rubidium clocks have been in orbit for more than a year, operating mostly as expected. The ESA said the timekeeping of the clocks on the Galileo spacecraft will play an important role in determining the overall accuracy of the system, so evaluation of their performance is a crucial part of the Galileo in-orbit verification process. The orbit of GIOVE-A is precisely measured by a network of 10 ground-based laser ranging stations, to provide orbital data independent of the navigation data. The technique used to characterize clock performance is a statistical method with a precision so great that tiny orbit disturbances caused by the pressure of sunlight shining on the satellites is taken into account. Comparisons between the on-board clocks and identical units undergoing on-ground life testing show no unexpected aging or performance degradation is occurring due to the space environment, so they are expected to easily exceed their required 12-year operational lifetime. Galileo, when fully deployed during the early years of the next decade, will be the first civilian positioning system to offer global coverage.
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